When a new variant is added with the initial cost and initial quantity, the QuickBooks Commerce Stock on Hand value is increased but is not synced over to QBO/Xero automatically. The change in SOH will have to be manually adjusted in QBO/Xero. The reason for this is if you already have QBO or Xero prior to using QuickBooks Commerce, pushing the new SOH value from QuickBooks Commerce may fluctuate the already up-to-date SOH value in QBO/Xero.